Plumbing – Toilet repeatedly clogs – is putting toilet bowl cleaner in the toilet’s tank causing the problem

If the problem is mineral clogging of the under-rim channels on the toilet, and this does produce the symptoms you describe, then neither CLR no vinegar may be enough to clear up the blockage. The traditional treatment is a cup or two of muriatic acid (HCl 36%, from the hardware store) down the overflow hole in the tank. That goes directly to the rim vents. Pour the stuff in, wait an hour, and flush. Gloves and eye protection are recommmended, and a funnel so as to avoid spillage and corroding the metal parts in your tank. This looks like decent writeup of the method: How to Fix a Slow Toilet

Someone told me to drain the tank. Then put duck tape over the holes under the rim. Add your cleaner of choice to the tank, (I poured directly into the bowl filler part as I was "flushing"). I used CLR. Let it sit for 30 minutes. Opened up the holes pretty well. Did it again. Flushes like new. I have HORRIBLE water, rust, iron ect. Give it a try. This is not spam, nor do I want to spent hundreds to replace it.